ALPI Men's Light Down Jacket - Cosmos Blue

Ref :
Key feature
Ultra-lightweight, warm and compressible down jacket. Protective hood, cut enables excellent freedom of movement for climbing, two-way zip for accessing harness and belaying
Users reviews
4.48 / 5 159 ratings


Products benefits

Optimum temperature
Recommended temperature use = - 10°C, Duck down: 85% down 15% feather
Compact design
Fill power = 800 Cuin (EU standard), pack away jacket into a pocket
Freedom of movement
Tight fitting cut with armholes suitable for mountaineering.
Ease of use
Two-way zip allowing user to open from the bottom up for belaying
2 hand rest pockets, 1 chest pocket, 1 storage pocket built-into jacket
Environmental impact
B Rating - Comparison: M long-sleeved warm jacket - technical details


Main fabric : 100.0% Polyamide Padding : 90.0% Grey duck down, Padding : 10.0% Grey duck feather
Approved by
team SIMOND mountaineers during numerous ascents. e.g.: Lepiney route / Trident du Tacul (Chamonix)
Designed to :
climbers and mountaineers looking for protection from the cold with an ultra light jacket.
2 years


Storage Tips
To ensure down inflates when jacket is not being used, store it unpacked in a dry and well ventilated place.

Additional information

Thermal insulation
Duck down 90% down and 10% feather with a fill power of 800 Cuin (EU standard). Jacket's assembly is partitioned, as is the hood. Pocket volume with jacket inside: 3.5 L (Size L) * Our feathers come from Chinese ducks farmed for their meat. We retrieve their feathers after they are culled. We keep the ducks death certificates
Temperature rating use
Our jackets have been tested in a laboratory, in a climatic chamber, allowing us to identify the recommended temperatures for use. For moderate activity (in 5 km/h wind), this jacket is suitable for temperatures up to -10°C.
Ultra light jacket at 360 g in size Large, The jacket is highly compressible, and can be packed away in its pocket. It is the ideal garment to put at the bottom of your bag and to take out when it gets cold.
Freedom of movement
Anatomic and close-fitting cut with armholes suitable for mountaineering (gullies, ice climbing, ski touring, ridge climbs) Hood volume enabling to wear hood over the helmet
Ease of use
Two-way front zip allowing you to partially open jacket for belaying and roping up.
Score to compare the environmental impact of products
The environmental impact of the product is calculated over its entire life cycle and with different indicators. An overall ABCDE rating is performed to help you easily identify the products with the best environmental performance by comparing the same type of products with each other (t-shirts, trousers, backpacks, ...). Decathlon is a committed stakeholder in this environmental labelling approach. To get more information:

Users reviews

4.48 / 5 159 ratings
148 users recommended this product

At Decathlon, reviews are reliable.

  • Man
    14 October 2019
    Use since 2 to 8 weeks
    That review has been deposited on this product version
    Good value product

    Warm and lightweight. He went up a size to get comfortable fit with layers.

  • 26 February 2019
    Use since 7 to 12 months
    That review has been deposited on this product version
    Best jacket for price

    Great down jacket.
    Worn in city and high mountain environment
    Chamonix to Reykjavik
    Pack nicely in its pocket and keeps warm up to -10

  • Man
    Under 20 years old
    07 January 2019
    Use since 1 week or less
    That review has been deposited on this product version

    Excellent jacket for the price, don’t pay £150 pound for some rab jacket much better with this. Decathlon in general is excellent for the price.